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| Loosen oil level test and filler plug. |
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| Screw the oil release control lid and tighten with the appropriate torque → Chapter. |

Note | Oil level is correct when the oil reaches the bottom edge of filling hole. |
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| Fill with new gear oil up to the correct level. |
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| Unscrew control lid, start engine and let the gears work with engaged gear for about 2 minutes. |
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| Stop the engine, remove oil cap and check level again, top up if necessary. |
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| Screw the oil level and filling control lid and tighten with the appropriate torque → Chapter. |
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| Install the middle soundproofing. |
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